Đáp án+Giải thích các bước giải:
$A=sin^232^o+cos^232^o-2.\dfrac{sin59^o}{cos31^o}$
$A=sin^232^o+cos^232^o-2.\dfrac{sin59^o}{sin59^o}$
$A=1-2.1$
$A=-1$
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$B=\dfrac{tan37^o}{cot53^o}+sin^219^o+cos^271^o$
$B=\dfrac{cot53^o}{cot53^o}+sin^219^o+sin^219^o$
$B=1+2sin^219^o$